Filler cap for a waterbed mattress



FIG. 1 is a top perspective view of a filler cap for a waterbed mattress showing my new design, the broken line disclosure being for illustrative purposes only;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view, the left side being a mirror image thereof;

FIG. 4 is a front elevational view, the rear being a mirror image thereof; and

FIG. 5 is a bottom plan view thereof.

The design is characterized by the combination of the particularly configured tabs being disposed at the top of the cap in association with the segmented main body portion, all as best illustrated in FIGS. 1 and 4. 

The ornamental design for a filler cap for a waterbed mattress, as shown and described. 